Hadith
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ عَبْدُ اللَّهِ سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ .
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It was narrated that Abu Wa'il said:"'Abdullah said: 'Defaming a Muslim is evildoing and fighting him is Kufr
Sahih · Abu Ghuddah
Sunan an-Nasa'i 4112 ·Book 37, Hadith 147·Also available on sunnah.com·